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Skyworks Solutions Inc. SI8641ET-AS2
- Part No.:
- SI8641ET-AS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8641ET-AS2.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:3,919
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Product details
Overview
SI8641ET-AS2 from Skyworks is a quad-channel digital isolator with 3 input channels on VDD1 side and 1 output channel on VDD2 side, rated for 5 kVRMS reinforced isolation in wide-body SOIC-16 package. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, features Schmitt-trigger inputs, tri-state outputs with enable control, and operates across –40 to 125 °C for industrial and automotive isolated communication interfaces.
For engineers reviewing the SI8641ET-AS2 datasheet, SI8641ET-AS2 pinout, SI8641ET-AS2 application, or SI8641ET-AS2 equivalent, key selection criteria include its 5 kVRMS reinforced VDE 0884-10 certification, selectable high-fail-safe default output state, ultra-low power consumption (3.5 mA per channel at 100 Mbps @ 2.5 V), and compatibility with isolated ADC/DAC, motor control, and battery management systems.
Technical Context
The SI8641ET-AS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing superior noise immunity over optocouplers. Its architecture delivers precise timing with ≤0.5 ns channel-channel skew and ≤2 ns propagation delay skew across temperature and voltage.
It integrates dual enable inputs (EN1 on VDD1 side, EN2 on VDD2 side) enabling independent tri-state control of A4 and B1–B3 channels. The device uses internal undervoltage lockout (UVLO) with 70 mV hysteresis per supply rail and supports fail-safe operation where powered outputs default to logic high during input-side power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation per VDE 0884-10; enables safety-critical barrier compliance in medical and EV systems. |
| Max Data Rate | 150 Mbps; supports high-speed SPI, RS-485, and isolated CAN FD signaling without timing bottlenecks. |
| Propagation Delay | 8 ns typical; ensures deterministic latency for real-time motor control loop feedback paths. |
| Channel Configuration | 3-input / 1-output split (A1–A3 → B1–B3, A4 ← B4); matches asymmetric interface requirements like isolated gate driver status + PWM return. |
| Supply Voltage Range | 2.5–5.5 V on both sides; allows direct interfacing with 3.3 V microcontrollers and 5 V analog subsystems without level shifters. |
| Fail-Safe Default | High output state when VDD1 unpowered; prevents unintended actuation in safety-critical power stage control. |
| CMTI | 100 kV/µs (Si864xxT variant); suppresses false triggering in high-dV/dt environments like traction inverters and SMPS. |
Pinout & Package
SI8641ET-AS2 is housed in a RoHS-compliant wide-body SOIC-16 package (8 mm creepage, -AS2 suffix), certified for reinforced insulation up to 5 kVRMS. Pin assignments follow Skyworks' standard Si864x layout with dedicated VDD1/GND1 and VDD2/GND2 rails, dual enable inputs, and Schmitt-triggered I/O.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input-side logic and RF transmitter; requires local 0.1 µF bypass capacitor. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm creepage for reinforced isolation compliance. |
| A1–A3 | Input channels (VDD1 side) | Schmitt-triggered digital inputs accepting 0–VDD1 logic; tolerate slow edges and high noise in industrial bus lines. |
| EN1 | Enable input (VDD1 side) | Controls tri-state of output A4; low disables A4, high or NC enables A4 to follow A4 input state. |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to output-side RF receiver and drivers; independent of VDD1 for galvanic separation. |
| GND2 | Output-side ground reference | Return path for VDD2; forms isolation barrier with GND1; critical for CMTI performance and safety certification. |
| B1–B3 | Output channels (VDD2 side) | CMOS outputs with 50 Ω nominal impedance; drive 15 pF loads directly; default high during VDD1 power loss. |
| EN2 | Enable input (VDD2 side) | Controls tri-state of outputs B1–B3; low disables all three, high or NC enables them to follow A1–A3 states. |
| A4 | Input channel (VDD1 side) | Fourth input, routed to output B4; used for bidirectional status reporting or auxiliary control signals. |
| B4 | Output channel (VDD2 side) | Corresponding output for A4; completes 3:1 asymmetric channel mapping required in isolated feedback architectures. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; guarantees 60-year lifetime at rated working voltage with no calibration needed. |
| Reinforced VDE 0884-10 certification | Validated for 10 kV surge capability and 5 kVRMS working voltage; satisfies IEC 62368-1 and IEC 60601-1 system-level safety requirements. |
| Tri-state enable architecture | EN1 and EN2 allow independent output gating-enabling dynamic bus sharing, clock synchronization, and fault-isolation sequencing. |
| Ultra-low power at 100 Mbps | 3.5 mA per channel @ 2.5 V / 100 Mbps; reduces thermal load and extends battery life in portable isolated sensors and BMS modules. |
| High CMTI (100 kV/µs) | Prevents data corruption in high-noise motor drives and inverters where fast switching induces >50 kV/µs common-mode transients. |
Applications
| Industrial Motor Control | Automotive Battery Management |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks for HVAC compressors and servo drives. IC Role / Device Role / Timing Role: SI8641ET-AS2 transmits isolated PWM commands (A1–A3 → B1–B3) while returning isolated fault status (A4 → B4), maintaining <8 ns propagation delay for tight loop timing. Use Value: Enables safe, high-efficiency switching at 20+ kHz with guaranteed 5 kVRMS barrier integrity and 100 kV/µs noise rejection. | Use Scenario: Providing galvanic isolation between MCU domain and high-voltage battery cell monitoring ICs in EV battery packs. IC Role / Device Role / Timing Role: SI8641ET-AS2 carries isolated voltage/current telemetry (A1–A3 → B1–B3) and thermal alert signals (A4 → B4) across the 400–800 V barrier with fail-safe high defaults. Use Value: Meets AEC-Q100 Grade 0 (–40 to 125 °C) and reinforced insulation requirements for ASIL-C functional safety compliance. |
| Isolated ADC Interface | Medical Patient Monitoring |
Use Scenario: Interfacing isolated sigma-delta ADCs (e.g., AMC130x) to host processors in industrial power analyzers and energy meters. IC Role / Device Role / Timing Role: SI8641ET-AS2 routes serial data clock (A1), data (A2), and frame sync (A3) from ADC to processor (B1–B3), while returning ready signal (A4 → B4). Use Value: Supports 150 Mbps data throughput with <0.5 ns channel skew-preserving phase accuracy in multi-channel synchronized sampling. | Use Scenario: Isolating ECG/EEG front-end analog signal chains from digital processing units in Class II medical devices. IC Role / Device Role / Timing Role: SI8641ET-AS2 transfers digitized biopotential data (A1–A3 → B1–B3) and alarm triggers (A4 → B4) across patient-connected barrier with reinforced 5 kVRMS rating. Use Value: Complies with IEC 60601-1 3rd ed. creepage/clearance and transient immunity requirements for patient-connected equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141DARZ | 4-channel, 150 Mbps, 3.75 kVRMS basic isolation; no reinforced VDE 0884-10; 10 ns max propagation delay. | Lacks 5 kVRMS reinforced rating and AEC-Q100 qualification; unsuitable for EV traction or medical patient-connected use. | Select only for cost-sensitive industrial automation where 3.75 kVRMS suffices and automotive/medical certifications are not required. |
| ISO7741FDWR | 4-channel, 100 Mbps, 5 kVRMS reinforced; 11 ns max propagation delay; 2.25–5.5 V supply; no selectable fail-safe default. | Lower data rate limits high-speed SPI/CAN FD use; fixed low-fail-safe conflicts with high-default safety logic in BMS. | Choose when lower speed is acceptable and fixed low-default aligns with system architecture-avoid if high-fail-safe or 150 Mbps is mandatory. |
Compared with ADUM141DARZ and ISO7741FDWR, SI8641ET-AS2 uniquely combines 150 Mbps speed, 5 kVRMS reinforced VDE 0884-10 certification, AEC-Q100 Grade 0 qualification, and programmable high-fail-safe behavior-making it the only option qualified for safety-critical EV battery monitoring and high-frequency motor control.
Availability
SI8641ET-AS2 is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management systems, isolated ADC interfaces, and medical patient monitoring equipment requiring stable component supply and long-term lifecycle support.
Supply support for SI8641ET-AS2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability applications.
The Si864x family was designed specifically for demanding industrial and automotive isolation needs-delivering robust RF-based digital isolation with reinforced safety ratings, ultra-low power, and extended temperature operation.
FAQ
What is the isolation rating and safety certification of SI8641ET-AS2?
SI8641ET-AS2 provides 5 kVRMS reinforced isolation certified to VDE 0884-10, UL 1577, CSA 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 for reinforced insulation, with 10 kV surge capability-validating its use in safety-critical EV, medical, and industrial systems where barrier integrity is mandated.
Does SI8641ET-AS2 support fail-safe operation, and how is it configured?
Yes, SI8641ET-AS2 has a factory-configured high-fail-safe mode: when VDD1 is unpowered, outputs B1–B4 default to logic high. This behavior is fixed per ordering code ('ET' = high default) and does not require external pull-ups. It ensures safe shutdown states in BMS and motor control applications where active-high enable signals dominate.
What are the supply voltage and operating temperature ranges for SI8641ET-AS2?
SI8641ET-AS2 operates from 2.5 V to 5.5 V on both VDD1 and VDD2 sides, supporting mixed-voltage system interfacing. Its ambient operating temperature range is –40 to 125 °C, and it is AEC-Q100 Grade 0 qualified-making it suitable for under-hood automotive, industrial drives, and outdoor power electronics.
How does the enable functionality work on SI8641ET-AS2?
SI8641ET-AS2 features two independent enable inputs: EN1 controls tri-state of output A4 (VDD1 side), and EN2 controls tri-state of outputs B1–B3 (VDD2 side). When an enable pin is low, its associated outputs enter high-impedance state-enabling dynamic bus sharing, fault isolation, and power-gating sequences without external logic.
What is the maximum data rate and timing performance of SI8641ET-AS2?
SI8641ET-AS2 supports up to 150 Mbps data rate with 8 ns typical propagation delay, 0.5 ns typical channel-channel skew, and 2 ns typical propagation delay skew. These values remain stable across –40 to 125 °C and 2.5–5.5 V supply, enabling deterministic timing in real-time control loops and high-speed serial interfaces.
SI8641ET-AS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 3/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.375V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8641ET-AS2 FAQ
1.How can I place an order for SI8641ET-AS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8641ET-AS2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI8641ET-AS2 reliable?
The price and inventory of SI8641ET-AS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8641ET-AS2 is usually 5 days.
3.What payment methods are accepted for SI8641ET-AS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8641ET-AS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8641ET-AS2?
SI8641ET-AS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8641ET-AS2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI8641ET-AS2?
For technical support, including SI8641ET-AS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8641ET-AS2 requirements.
6.How does Aetrix verify that SI8641ET-AS2 is sourced from the original manufacturer or authorized distributors?
All SI8641ET-AS2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI8641ET-AS2 meets industry standards.
7.What is the process for return or replacement of SI8641ET-AS2?
All SI8641ET-AS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8641ET-AS2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI8641ET-AS2 part is unused and in its original packaging.
Return procedure for SI8641ET-AS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8641ET-AS2 Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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